National Weather Service Forecast for: Affton MO
Issued by: National Weather Service Saint Louis, MO
Updated: 3:41 am CDT Jul 25, 2025
 
Today

Today: A 20 percent chance of showers and thunderstorms after 4pm.  Mostly sunny, with a high near 94. Heat index values as high as 106. Southeast wind 3 to 6 mph.
Mostly Sunny
then Slight
Chance
T-storms
Tonight

Tonight: A 20 percent chance of showers and thunderstorms before 9pm.  Partly cloudy, with a low around 77. South wind 3 to 6 mph.
Slight Chance
T-storms then
Partly Cloudy
Saturday

Saturday: A slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 95. Heat index values as high as 110. South wind 3 to 7 mph.  Chance of precipitation is 30%.
Slight Chance
Showers then
Chance
T-storms
Saturday
Night
Saturday Night: A 20 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 77. South wind 3 to 6 mph.
Slight Chance
T-storms

Sunday

Sunday: A 30 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 96. Calm wind becoming southwest around 5 mph in the afternoon.
Sunny then
Chance
T-storms
Sunday
Night
Sunday Night: Mostly clear, with a low around 79.
Mostly Clear

Monday

Monday: Sunny and hot, with a high near 99.
Hot

Monday
Night
Monday Night: Mostly clear, with a low around 80.
Mostly Clear

Tuesday

Tuesday: Sunny and hot, with a high near 99.
Hot

Hi 94 °F Lo 77 °F Hi 95 °F Lo 77 °F Hi 96 °F Lo 79 °F Hi 99 °F Lo 80 °F Hi 99 °F

Extreme Heat Warning
Hazardous Weather Outlook
 

Today
 
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. Heat index values as high as 106. Southeast wind 3 to 6 mph.
Tonight
 
A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 77. South wind 3 to 6 mph.
Saturday
 
A slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. Heat index values as high as 110. South wind 3 to 7 mph. Chance of precipitation is 30%.
Saturday Night
 
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 77. South wind 3 to 6 mph.
Sunday
 
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Calm wind becoming southwest around 5 mph in the afternoon.
Sunday Night
 
Mostly clear, with a low around 79.
Monday
 
Sunny and hot, with a high near 99.
Monday Night
 
Mostly clear, with a low around 80.
Tuesday
 
Sunny and hot, with a high near 99.
Tuesday Night
 
Mostly clear, with a low around 78.
Wednesday
 
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Wednesday Night
 
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Thursday
 
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Affton MO.